Bro,- you're still young,- okay lang iyan. Enjoy it while it lasts. How are your father and mother, uncles and aunts, bros and sis? Payat ba rin sila? If they are, then, it is in your genes.
Generally,- wait until you grow older,- tanong mo naman,- "Paano ba magpapayat?"
KaTuGa lang ang katapat niyan,- KAin, TUlog, GAla.....
Also, baka may alaga ka ngang ulupong sa tiyan (although I doubt kung mayroon pa, at your age),- Combantrin ang katapat niyan,- but it is imperative to consult your doctor here, please....
And while at it, ipa-check mo rin ang thyroid mo....